Pin-tumbler for cylinder-locks.



No. 649,255. 7 Patentod'lay 8, 1900.

c. n. NOAGK.

PIN, TUMBLEB FOB CYLINDER LOCKS. Aj umion med Augv 10, was. (No Model.)

B a WITNESSES INVENTO/Y NITED STATES ATEN uric.

PlN-TUMBLER F OR CYLINDER-LOCKS.

SPECIFICATION formingpart of Letters Patent No. 649,255, dated May 8,1900.

Application filed August 10, 1899. Serial. No. 726,748. (No model.)

To all whom it may concern.-

Be it known that I, CARL O. NOAOK, a citizen of the United States,residingin Stamford, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inPin-Tumblers for Cylinder-Locks, of which the following is aspecification.

This invention relates to improvements in the construction ofpin-tumblers for cylinderlocks, the object of the improvement being tofacilitate the insertion or withdrawal of the key into or fromcylinder-locks, so that the locks are operated in an easy manner, whilethe wear and friction are reduced to a minimum.

The invention consists, first, of a pin-tumbler for cylinder-lockshaving an antifrictionball mounted in its lower end, and the inventionconsists, secondly, of a pin-tumbler for cylinder-locks having anantifriction-ball located in the recessed and contracted lower end ofthe tumbler.

In the accompanying drawings, Figure -1 represents ,a verticallongitudinal section of a cylinder-lock with my improved pin-tumblers.Fig. 2 is a side elevation of my pintumbler, drawn on a larger scale;and Fig. 3 is a vertical section of Fig. 2 on line 3 3.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents a pin-tumbler for cylinder-lockswhich is provided with a recess a, that is formed at its lower end. Inthe recess a is mounted an antifriction-ball B, which is retained bycontracting the beveled edge of the lower end sufficiently to form aretaining-flange b for holding the ball in place. The recess a is formedin the lower end of the pin-tumbler by a suitable drill, after which theinner surface of the edge is beveled, so that when the ball B isinserted into the recess the lower the key, for the reason that thebittings of the key move over rolling surfaces, whereby .the wear of thekey is also greatly reduced.

, My improved pin-tumblers can be used in any pin-tumbler cylinder-lockand can be operated by any form of key employed in such looks. The shapeof the notches of the key may be varied, as well as the means by whichthe balls are held in place at the lower ends of the tumblers, as theinvention consists mainly of a pin-tumbler having an antifriction-ballmounted in its lower end.

I am aware that it is old, broadly, to arrange ball=bearings inconnection with the tumblers of a cylinder-lock, and I do not,therefore, broadly claim the same.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A pin-tumbler for cylinder-locks provided with anantifriction-ball mounted in its lower end, substantially as set forth.

2. A pin-tumbler for cylinder-locks, provided with an antifriction-balllocated in a recess formed in the lower end of the tumbler, and retainedby the contracted lower end of the tumbler, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

CARL 0.. NOACK.

\Vitnesses:

F. B. GURLEY, WILLIAM F. WATERBURY.

